routedns/lua-error.go

package rdns

import (
	"errors"

	lua "github.com/yuin/gopher-lua"
)

// Error functions

const luaErrorMetatableName = "Error"

func (s *LuaScript) RegisterErrorType() {
	L := s.L
	mt := L.NewTypeMetatable(luaErrorMetatableName)
	L.SetGlobal(luaErrorMetatableName, mt)

	// static attributes
	L.SetField(mt, "new", L.NewFunction(
		func(L *lua.LState) int {
			err := errors.New(L.CheckString(1))
			L.Push(userDataWithMetatable(L, luaErrorMetatableName, err))
			return 1
		}))

	// methods
	L.SetField(mt, "__index", L.SetFuncs(L.NewTable(), map[string]lua.LGFunction{
		"error": method(func(L *lua.LState, r error) int {
			L.Push(lua.LString(r.Error()))
			return 1
		}),
	}))
}